JPH01318721A - Driving device for turbo charger with rotary motor - Google Patents

Abstract

PURPOSE:To increase the output of an engine by connecting in order a turbo charger equipped with a motor and an exhaust turbine equipped with a generator and driving the engine by feeding the generator output and battery output to a motor at the low speed rotation time of the engine especially. CONSTITUTION:The rotor of a rotary motor 3 is linked to the rotary shaft directly connecting the turbine 21 of the turbo charger 2 provided on the way of an exhaust pipe and the compressor provided on the way of a suction pipe 11 and a stator is provided on the inner wall of a turbo charger housing. The exhaust turbine 4 driven by the exhaust gas energy exhausted from the turbo charger 2 is provided, an AC generator 42 is directly connected to this exhaust turbine 4 and the AC power generated there is transmitted to a power converter 5. In this power converter 5 the generated power transmitted from the AC generator 42 and the power from a battery 7 are input and the specified AC power driving the rotary motor 3 is made to output.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a driving device for a turbocharger with a rotating electric machine that uses a turbocharger with a rotating electric machine to increase engine torque.

(Prior Art) In recent years, various proposals have been made to increase engine torque by guiding exhaust gas emitted from a vehicle engine to a turbine to recover exhaust energy.

As a proposal of this type, the present applicant sequentially disposed a plurality of exhaust turbines each equipped with a DC generator in the exhaust pipe of the engine, coupled a DC motor to the rotating shaft of the engine, and Japanese Patent Laid-Open No. 59-20526 discloses an exhaust gas energy recovery device for an engine that supplies electric power from a DC motor to a DC motor and recovers exhaust energy as engine output.

(Problem to be Solved by the Invention) In the above proposal, the exhaust gas energy of the engine is converted into electrical energy by an exhaust turbine having a DC generator, and this electrical energy is then supplied to a DC motor coupled to the engine to rotate it. It assists the engine output as power. In this case, there is a problem in that when the engine rotation speed is low, the exhaust gas energy exhausted is small, and regenerating this energy into electric power to drive the output shaft of the engine does not have a sufficient effect of improving torque.

The present invention was made in view of such problems,
The object of the present invention is to provide a driving device for a turbocharger with a rotary electric machine, which attempts to increase engine torque by supplying supercharged air to the engine using electrical energy regenerated by an exhaust turbine having a generator.

(Means for Solving the Problems) According to the present invention, a turbocharger equipped with an electric motor and an exhaust turbine equipped with a generator are sequentially connected to the exhaust pipe of an engine, and the Accordingly, there is provided a driving device for a turbocharger with a rotary electric machine that supplies both the output of the generator and the output of the battery to the electric motor at least when the engine rotates at low speed.

(Function) In the present invention, the output of the generator provided in the exhaust turbine is supplied to the electric motor of the turbocharger together with the electric power from the battery to power the turbocharger, thereby assisting the supercharging operation of the turbocharger and increasing the engine torque. be.

(Example) Next, an example of the present invention will be described in detail using the drawings.

FIG. 1 is a block diagram showing the structure of an embodiment of the present invention, and FIG. 2 is a sectional view showing the structure of a turbocharger used in this embodiment.

In these drawings, 1 is an engine that drives a vehicle (not shown) by combustion energy of air taken in through an intake pipe 11 and fuel supplied.
The exhaust gas after combustion is supplied to the turbocharger 2 through the exhaust pipe 12 and drives the turbine 21 to rotate. 22
is a compressor, which is directly connected to the rotating shaft 23 of the turbine 21, and the turbine 21 is rotationally driven by exhaust energy.
The compressor compresses air using the torque of the compressor, supercharges the air from the intake pipe 11 to the engine via the scroll 24, and is configured to increase the engine output by operating the compressor 22. Note that 13 is a boost pressure sensor that detects supercharging pressure and is attached to the inner surface of the intake pipe 11, and 14 is an engine rotation sensor that detects the engine rotation speed. Signals from these sensors will be described later. Sent to controller.

3 is a rotating electric machine, and a rotor 3 is directly connected to a rotating shaft 23.
1 and a stator 32 attached to the inner wall of the housing 25 of the turbocharger 2, and the rotor 31 constitutes a recognition type rotating electric machine including, for example, a cage-shaped coil. When sufficient supercharging operation of the compressor 22 cannot be obtained with the driving force of the turbine 21 generated by the exhaust energy, electric power is supplied to the rotating electric machine 3 to cause it to run.
This assists the supercharging operation of the compressor 22.

Note that 33 is a turbine rotation sensor that detects the rotation speed of the turbocharger 2 by detecting the rotation speed of the compressor 22, for example, and sends the detected rotation signal to the controller 6.
Send to.

Reference numeral 4 denotes an exhaust turbine, which is driven by exhaust gas energy discharged from the turbocharger 2 , and a manpower pipe 41 for inputting the exhaust gas is connected to the turbocharger 2 . An alternating current generator 42 is directly connected to the exhaust turbine 4 and regenerates exhaust gas energy from the turbocharger 2 as alternating current power, and the regenerated power is transmitted to the power converter 5. Note that 43 is an exhaust pipe that discharges exhaust gas from the exhaust turbine 4 to the outside.

The power converter 5 inputs the output power from the alternating current generator 42 and the electric power from the battery 7, and converts it into predetermined alternating current power for powering the rotating electric machine 3. It is equipped with high-power equipment such as a rectifier that rectifies the alternating current output of the alternator 42 and an inverter that adds the output of the rectifier and the direct current power of the battery 7 and converts it into alternating current power of a desired frequency. The frequency control command is received from the controller 6.

Note that when the output from the alternator 42 provided in the exhaust turbine 4 is large, the rotating electric machine 3 is configured to be driven only by the output of the alternator 42 without using the electric power from the battery 7.

8, engine 1 is activated by the driver's operation using the accelerator pedal.
An accelerator sensor 81 is attached to detect the amount of depression of the accelerator pedal 8, and sends a detection signal to the controller 6.

The controller 6 is composed of a microcomputer, and includes a central control unit that performs arithmetic processing, various mechanisms for storing arithmetic results, control programs, etc., a human/output boat, etc., and includes the aforementioned boost pressure sensor 13 and engine rotation sensor 14. , turbine rotation sensor 33, accelerator sensor 81
When a detection signal is input from, etc., calculation processing is performed.
It is configured to issue a control command to convert the frequency of AC power to the inverter 5 according to a control program.

The operation of this embodiment configured as described above will now be described.

If it is necessary to increase the engine torque when the engine rotates at a low speed, the controller 6 detects this based on detection signals from the accelerator sensor 81, engine rotation sensor 14, and turbine rotation sensor 33, and sends the power converter 5 to generate AC power. A command is given to supply the output of the machine 42 and the electric power from the battery 7 to the rotating electric machine 3. Therefore, the power converter 5 rectifies the alternating current power from the alternator 42 and adds it to the direct current power from the battery 7, and also converts the alternating current power from the alternating current generator 42 into alternating current power of a required frequency to power the rotating electric machine 3 as an i-motor. 3
It will be supplied to Since the detection signal from the turbine rotation sensor 33 is input to the controller 6, this required frequency can detect the current rotation speed of the rotating electric @3, and the current rotation speed of the rotating electric power @3 can be detected. The controller 6 issues a command to the power converter 5 to set the power frequency.

Therefore, the rotation shaft of the turbocharger 2 is accelerated by the power running of the rotating electrical machine 3, the supercharging operation of the compressor 22 is also increased, and the boosted supercharging air is supplied to the engine l, thereby increasing the engine torque. It turns out.

Note that, depending on the degree of increase in engine torque, the power supply from the battery 7 may be canceled and only the output of the alternator 42 may be converted and supplied.

Although the present invention has been described above with reference to the above-mentioned embodiments, various modifications and applications are possible within the scope of the gist of the present invention, and these are not excluded from the scope of the present invention.

(Effects of the Invention) According to the present invention, electrical energy regenerated by an exhaust turbine equipped with an alternating current generator is supplied to a turbocharger with a rotating electric machine together with electric power from a battery, thereby increasing the speed of the turbocharger and supplying power to the engine. Since the supercharging air is further boosted, the engine output increases, and the engine torque is increased more efficiently than when the recovered electrical energy is used as mechanical rotational force to assist the engine output. effective.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention, and FIG. 2 is a sectional view of a turbocharger used in this embodiment. 1...Engine, 2...Turbocharger, 3...
- Rotating electric machine, 4... Exhaust turbine, 5... Power converter, 6... Controller, 7... Battery, 8...
- Accelerator pedal, 21...turbine, 22...compressor, 42...alternator. Patent applicant Isuy Automobile Co., Ltd.

Claims (2)

[Claims] (1) A turbocharger equipped with an electric motor and an exhaust turbine equipped with a generator are sequentially connected to the exhaust pipe of the engine, and the output of the generator is determined at least when the engine rotates at low speed depending on the operating state of the engine. 1. A driving device for a turbocharger with a rotating electrical machine, characterized in that both the power output and the battery output are supplied to the electric motor for power running. (2) The drive device for a turbocharger with a rotary electric machine according to claim (1), wherein only the generated output of a generator is supplied to the electric motor for power running.